html - Basic javascript isn't working - display block -

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if user selects "house" want new select option box pop up. nothing happening.

function showfamilies(){  if(pt.selectedindex == 1) document.getelementbyid('families').style.display = 'block';  if(pt.selectedindex != 1) document.getelementbyid('families').style.display = 'none'; }   <select id="pt" value="pt" name="pt" onchange="showfamilies()"> <option value="" name="">select</option> <option value="1" name="1">house</option> <option value="2" name="2">commercial</option> </select>  <div id="families" style="display:none">families:  <select name="amin_families"> <option value="1" name="condo">1</option> <option value="2" name="co-op">2</option></select> </div>

redefined if statement. works fine now.

<!doctype html> <html> <head>     <script type="text/javascript">     function showfamilies(pt){      if(pt.selectedindex == 1)     {     document.getelementbyid('families').style.display = 'block';     }     else     {     document.getelementbyid('families').style.display = 'none';     }     }     </script>     <title></title> </head> <body>    <select id="pt" value="pt" name="pt" onchange="showfamilies(this)">     <option value="" name="">select</option>     <option value="1" name="1">house</option>     <option value="2" name="2">commercial</option> </select>  <div id="families" style="display:none">families:     <select name="amin_families">         <option value="1" name="condo">1</option>         <option value="2" name="co-op">2</option></select> </div> </body> </html>

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